What to do with a 4.7-F (not -uF) cap?

2/14/2009 11:38:37 PMDoug Criner

I've been reading about these super-caps. Here's a 4.7-F cap, 0.5" dia x 1.26", for $3.85: http://www.allelectronics.com/index.php?page=search&search_query=cbc-18

These things have a million times more capacitance than conventional caps of the same size.

I'm trying to think up a useful project. An LED that might light for months or years? A micro welding machine? A "perpetual" grid bias C- supply? A super pulsed laser?

The voltage rating, 2.5-V, is pretty puny, though.
Doug

2/15/2009 12:10:41 AMMarv Nuce

Doug,
Don't try a white LED, they like 3.6V, but maybe a blue one would last for a few hours. Red and green might last longer. Have you been able to measure the leakage on that cap?

marv

:I've been reading about these super-caps. Here's a 4.7-F cap, 0.5" dia x 1.26", for $3.85: http://www.allelectronics.com/index.php?page=search&search_query=cbc-18
:
:These things have a million times more capacitance than conventional caps of the same size.
:
:I'm trying to think up a useful project. An LED that might light for months or years? A micro welding machine? A "perpetual" grid bias C- supply? A super pulsed laser?
:
:The voltage rating, 2.5-V, is pretty puny, though.
:Doug

2/15/2009 12:24:51 AMPeter G. Balazsy

How about putting one in a back pack with a long cord to your wrist watch at birth.... and It'll run till you go to your grave...lol

2/15/2009 12:41:31 AMLewis L

:How about putting one in a back pack with a long cord to your wrist watch at birth.... and It'll run till you go to your grave...lol

Some mornings I feel like about 20 uFd. would be all I need for that, since I can't go back to zero time. {:>)}
Lewis

2/15/2009 7:15:50 AMGary W. Prutchick

Doug,

What about a bias cell. I wonder how long one charge would last?

I am going to do some calcs and get back to you.

Gary

:I've been reading about these super-caps. Here's a 4.7-F cap, 0.5" dia x 1.26", for $3.85: http://www.allelectronics.com/index.php?page=search&search_query=cbc-18
:
:These things have a million times more capacitance than conventional caps of the same size.
:
:I'm trying to think up a useful project. An LED that might light for months or years? A micro welding machine? A "perpetual" grid bias C- supply? A super pulsed laser?
:
:The voltage rating, 2.5-V, is pretty puny, though.
:Doug

2/15/2009 11:15:45 AMNorm Leal

Hi Doug

These caps are already being used in rechargeable devices. Those item you shake or wind to charge.

Norm

:Doug,
:
:What about a bias cell. I wonder how long one charge would last?
:
:I am going to do some calcs and get back to you.
:
:Gary
:
::I've been reading about these super-caps. Here's a 4.7-F cap, 0.5" dia x 1.26", for $3.85: http://www.allelectronics.com/index.php?page=search&search_query=cbc-18
::
::These things have a million times more capacitance than conventional caps of the same size.
::
::I'm trying to think up a useful project. An LED that might light for months or years? A micro welding machine? A "perpetual" grid bias C- supply? A super pulsed laser?
::
::The voltage rating, 2.5-V, is pretty puny, though.
::Doug

2/15/2009 1:50:52 PMi would

:I've been reading about these super-caps. Here's a 4.7-F cap, 0.5" dia x 1.26", for $3.85: http://www.allelectronics.com/index.php?page=search&search_query=cbc-18
:
:These things have a million times more capacitance than conventional caps of the same size.
:
:I'm trying to think up a useful project. An LED that might light for months or years? A micro welding machine? A "perpetual" grid bias C- supply? A super pulsed laser?
:
:The voltage rating, 2.5-V, is pretty puny, though.
:Doug

use one of these caps and discharge it across g bergs nutsack when he gets out of line

2/15/2009 6:00:40 PMLewis L(71164:71157)

::I've been reading about these super-caps. Here's a 4.7-F cap, 0.5" dia x 1.26", for $3.85: http://www.allelectronics.com/index.php?page=search&search_query=cbc-18
::
::These things have a million times more capacitance than conventional caps of the same size.
::
::I'm trying to think up a useful project. An LED that might light for months or years? A micro welding machine? A "perpetual" grid bias C- supply? A super pulsed laser?
::
::The voltage rating, 2.5-V, is pretty puny, though.
::Doug
:
:use one of these caps and discharge it across g bergs nutsack when he gets out of line
Children will be children, I gurss.

2/16/2009 2:11:57 PMWalt(71202:71164)

These caps are an experimenter's delight. I have one of lower capacity, but a 5.5 wvdc rating. More useful as a volitile memory storage backup than a battery. They are slow to charge or discharge. I have a Casio solar powered watch that has been going non-stop for about 20 years. I got tired of replacing batteries.

2/17/2009 5:37:33 PMJohn(71247:71202)

: These caps are an experimenter's delight. I have one of lower capacity, but a 5.5 wvdc rating. More useful as a volitile memory storage backup than a battery. They are slow to charge or discharge. I have a Casio solar powered watch that has been going non-stop for about 20 years. I got tired of replacing batteries.
Dumb questions but I have to ask. Do you occasionally juice up the cap to recharge it and how do you wear the watch with an external cap hooked to it?

2/17/2009 5:59:15 PMLewis L(71250:71247)

:: These caps are an experimenter's delight. I have one of lower capacity, but a 5.5 wvdc rating. More useful as a volitile memory storage backup than a battery. They are slow to charge or discharge. I have a Casio solar powered watch that has been going non-stop for about 20 years. I got tired of replacing batteries.
:
:Dumb questions but I have to ask. Do you occasionally juice up the cap to recharge it and how do you wear the watch with an external cap hooked to it?

Since he said the watch was solar powered, I guess he was referring to his dislike of changing batteries.
Lewis

2/17/2009 8:04:41 PMG. Berg(71251:71164)

:::I've been reading about these super-caps. Here's a 4.7-F cap, 0.5" dia x 1.26", for $3.85: http://www.allelectronics.com/index.php?page=search&search_query=cbc-18
:::
:::These things have a million times more capacitance than conventional caps of the same size.
:::
:::I'm trying to think up a useful project. An LED that might light for months or years? A micro welding machine? A "perpetual" grid bias C- supply? A super pulsed laser?
:::
:::The voltage rating, 2.5-V, is pretty puny, though.
:::Doug
::
::use one of these caps and discharge it across g bergs nutsack when he gets out of line
:
:
:
:Children will be children, I gurss.
LOL EVEN I HAVE TO LAUGH AT THE THOUGH OF THAT...lol THANKS LEWIS

2/17/2009 9:44:03 PMLewis L(71258:71251)

::::I've been reading about these super-caps. Here's a 4.7-F cap, 0.5" dia x 1.26", for $3.85: http://www.allelectronics.com/index.php?page=search&search_query=cbc-18
::::
::::These things have a million times more capacitance than conventional caps of the same size.
::::
::::I'm trying to think up a useful project. An LED that might light for months or years? A micro welding machine? A "perpetual" grid bias C- supply? A super pulsed laser?
::::
::::The voltage rating, 2.5-V, is pretty puny, though.
::::Doug
:::
:::use one of these caps and discharge it across g bergs nutsack when he gets out of line
::
::
::
::Children will be children, I gurss.
:
:LOL EVEN I HAVE TO LAUGH AT THE THOUGH OF THAT...lol THANKS LEWIS

5.5 Volts doesn't sound too painful to me.
Lewis

2/18/2009 9:27:35 AMJerry(71275:71258)

::::use one of these caps and discharge it across g bergs nutsack when he gets out of line
:::
:::
:::
:::Children will be children, I gurss.
::
::LOL EVEN I HAVE TO LAUGH AT THE THOUGH OF THAT...lol THANKS LEWIS
:
:
:5.5 Volts doesn't sound too painful to me.
:Lewis
I guess that depends on how many of these caps you wire in series before discharging them on the testicular region :)